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diff --git a/extern/draco/draco/src/draco/attributes/attribute_quantization_transform.h b/extern/draco/draco/src/draco/attributes/attribute_quantization_transform.h
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+// Copyright 2017 The Draco Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef DRACO_ATTRIBUTES_ATTRIBUTE_QUANTIZATION_TRANSFORM_H_
+#define DRACO_ATTRIBUTES_ATTRIBUTE_QUANTIZATION_TRANSFORM_H_
+
+#include <vector>
+
+#include "draco/attributes/attribute_transform.h"
+#include "draco/attributes/point_attribute.h"
+#include "draco/core/encoder_buffer.h"
+
+namespace draco {
+
+// Attribute transform for quantized attributes.
+class AttributeQuantizationTransform : public AttributeTransform {
+ public:
+  AttributeQuantizationTransform() : quantization_bits_(-1), range_(0.f) {}
+  // Return attribute transform type.
+  AttributeTransformType Type() const override {
+    return ATTRIBUTE_QUANTIZATION_TRANSFORM;
+  }
+  // Try to init transform from attribute.
+  bool InitFromAttribute(const PointAttribute &attribute) override;
+  // Copy parameter values into the provided AttributeTransformData instance.
+  void CopyToAttributeTransformData(
+      AttributeTransformData *out_data) const override;
+
+  void SetParameters(int quantization_bits, const float *min_values,
+                     int num_components, float range);
+
+  bool ComputeParameters(const PointAttribute &attribute,
+                         const int quantization_bits);
+
+  // Encode relevant parameters into buffer.
+  bool EncodeParameters(EncoderBuffer *encoder_buffer) const;
+
+  int32_t quantization_bits() const { return quantization_bits_; }
+  float min_value(int axis) const { return min_values_[axis]; }
+  const std::vector<float> &min_values() const { return min_values_; }
+  float range() const { return range_; }
+  bool is_initialized() const { return quantization_bits_ != -1; }
+
+  // Create portable attribute using 1:1 mapping between points in the input and
+  // output attribute.
+  std::unique_ptr<PointAttribute> GeneratePortableAttribute(
+      const PointAttribute &attribute, int num_points) const;
+
+  // Create portable attribute using custom mapping between input and output
+  // points.
+  std::unique_ptr<PointAttribute> GeneratePortableAttribute(
+      const PointAttribute &attribute, const std::vector<PointIndex> &point_ids,
+      int num_points) const;
+
+ private:
+  int32_t quantization_bits_;
+
+  // Minimal dequantized value for each component of the attribute.
+  std::vector<float> min_values_;
+
+  // Bounds of the dequantized attribute (max delta over all components).
+  float range_;
+};
+
+}  // namespace draco
+
+#endif  // DRACO_COMPRESSION_ATTRIBUTES_ATTRIBUTE_DEQUANTIZATION_TRANSFORM_H_